{"product_id":"carrier-c4850c48z6105610-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48Z6105610","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48Z6105610\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48Z6105610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, control board, and all low-voltage switching circuits. When the transformer fails, the entire control circuit loses power — the thermostat goes blank, the system won't respond to any call for heating or cooling, and no staging or safety circuits can operate. It is often the first component to inspect when nothing works and there is no obvious mechanical failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 control transformer | Factory OEM part number HT01BD236 | Direct plug-in or wire-lead mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to Carrier's exact VA and impedance spec, ensuring stable 24V output under full load. Undersized or off-spec generic transformers can sag voltage, causing nuisance lockouts and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or terminal connectors. Label all low-voltage wires before removal and confirm secondary output reads 24–28V AC after installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C4850C48Z6105610\u003c\/strong\u003e packaged unit. Always verify the existing transformer's VA rating and primary\/secondary voltages on your unit's data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909869719923,"sku":"CARRIE-C4850C48Z6105610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909869752691,"sku":"CARRIE-C4850C48Z6105610-TRANSFORMER-HT01BD236-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD236_468bbd29-f097-4047-9f77-2534180cd3cf.jpg?v=1782940073","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48z6105610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}